M1：迅速扩张中的蟹状星云
2020 January 19 M1: The Incredible Expanding Crab Nebula Video Credit & Copyright: Detlef Hartmann Explanation: Are your eyes good enough to see the Crab Nebula expand? The Crab Nebula is cataloged as M1, the first on Charles Messier’s famous list of things which are not comets. In fact, the Crab is now known to be a supernova remnant, an expanding...